You know that the coticule + milky slurry becomes an aggressive cutter capabile of setting a bevel, right? (vs. coticule+water=fine polisher)
-Chief
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This is my lower grit natural stone. It is just a lump of Thai granite. It's the same stone they use to make mortar and passel. It works great for setting a bevel or sharpening kitchen knives that my in-laws have abused. I use a small fine diamond hone to raise a slurry.